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Do you have any A/C codes on the dash? Alternator working properly? Have you tried a new blower motor on this yet?
Sounds like there is a voltage issue getting to the blower motor from the alternator or the voltage regulator, which is in the alternator. The only time I have had a fan do that it wasn;t the fan, it was the alternator not supplying enough power to the cab of the truck and the blower was shut down for protection of the truck to kep the engine running. I know it sounds weird, but these systems are module controlled and that is what it di with me. Check the alternator output first and rule it out.
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